bug#31977: clone tests fail on CentOS 7

[zimoun]

Hi Paul,

Since the fix 8bc5ca5160db3d82bd5b6b2b7ed80c96f42bd33e breaks
linux-libre kernel on Guix System, because of [1], quote:

        Well, it is expected.  And now all is clear.  Explanations starting
        there:

           <http://logs.guix.gnu.org/guix/2020-12-07.log#211011>

        Quickly said, the initial code was assuming Debian-like kernel patches
        as Vagrant reported and this is not in the linux-libre source code with
        a wrong Guix error message.

        One bug is still there. :-)

1: <86zh2p4921.fsf@gmail.com">https://yhetil.org/guix/86zh2p4921.fsf@gmail.com>


If I understand well your message:

        Files:
        a) '/proc/self/ns/user' exists
        b) '/proc/sys/kernel/unprivileged_userns_clone' does not exist.

from your initial report, it is the same problem as linux-libre:
somehow, the assumption of '/proc/sys/kernel/unprivileged_userns_clone'
is Debian-like and not shared.

So, it could be nice to have a good story for that. :-)


All the best,
simon